Rust: simplify upgrade script

Author: redsun82

rust/ql/lib/upgrades/a1005655e9efc9f67d3aa2b7a3128f6b80d405a9/upgrade.properties

@@ -1,5 +1,5 @@
 description: Add `function_has_implementation` and `const_has_implementation` tables
 compatibility: backwards
 
-function_has_implementation.rel: run upgrade.ql new_function_has_implementation
-const_has_implementation.rel: run upgrade.ql new_const_has_implementation
+function_has_implementation.rel: reorder function_bodies (@function id, @block_expr body) id
+const_has_implementation.rel: reorder const_bodies (@const id, @expr body) id